You’re missing more than a few things! ASP.NET is orders of magnitudes more productive, robust, and maintainable than old-school ASP ever thought about being. Server side controls, third-party controls, master pages, forms authentication, forms validation, an OO model than encourages appropriate application partitioning, easy deployment, built-in debugging and tracing, state management.
You even have the choice of WebForms or MVC. It’s not an understatement to say that you are simply out of your mind if you don’t thoroughly investigate what you’re missing.